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Berakhot 4:4: Rabbi Eliezer says: One who makes his prayer "set" [as
though it is burdensome to him], his prayer does not constitute "pleading" [for
Divine mercy]. Rabbi Yehoshua says: One who is traveling in a dangerous place
should offer a brief prayer [and] say: Save, G-d, Your people, the remnant of
Israel; at every period of transition let their needs be before You. You are the
Source of all blessing, G-d, Who heeds prayer.

Berakhot 4:5: If one was riding a donkey, he should dismount from it
[while he prays]. And if he is unable to dismount, he should turn his face
[towards Jerusalem]. And if he is unable to turn his face, he should focus his
heart toward the Holy of Hollies [in the Temple in Jerusalem].